> wasnt sure how to adjust for the difference between true and magnetic
The difference between the two is called Variation. If you are due
south of the Magnetic pole, the variation is 0. This would apply to
most people in zones 8 and 9. On the West Coast, you'd have easterly
variation (i.e. magnetic north is east of true north) and on the East
Coast you'd have westerly variation. Somewhere in NWT, when you're
between the two, you'd actually have 180 degrees variation!
Antennas should probably be on true bearings, as any map you would be
using (including great circle maps) would use true bearings.
Remember that, for most antennas, a difference of a few degrees would
be immaterial. The patterns are just too broad. Only VHF and very
high gain high band arrays would be different. And, of course, a
Chris R. Burger
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